By default to access SSIS you need Local Administrator rights to the Server with SSIS installed on.

To allow a user access to SSIS without Local Admins you need to follow a MSDN article:

One thing to note is, although we only wanted a user to access SSIS remotely and have no abilities to RDP onto the machine. We still had to give them Local and Remote rights, in both “Launch & Activation” and “Access”¬†permissions.